Received: by 2002:a05:6a10:a0d1:0:0:0:0 with SMTP id j17csp1353127pxa; Sun, 2 Aug 2020 04:52:10 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxr2QVV7zE7dUGw3c0iUiUe7v0gLP724w8vzw4mGzjYBz60ocvCJGbQnc1jK9H+B9/cDej6 X-Received: by 2002:aa7:d411:: with SMTP id z17mr11577572edq.85.1596369130508; Sun, 02 Aug 2020 04:52:10 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1596369130; cv=none; d=google.com; s=arc-20160816; b=z3j9At2LpLvXeYivzIC3qoFLocUrKz0NA3sRlB9LvJC+N9ob2D1ae9+CM6QqZVJq3c RABClVewu4ibIg/vWXi876OKygV3YarixItp17cGNbY+L5iFSvyGfLD2SM9sFzKzp8h1 2R/SXZKoy7QabCDVBhPZvHHwSGZ9WiqFVMkbpH755fwZGIfsYcfTzDE5RaUzBakt7O+I YwXB793v+Q6M6XlrCbixhlS6005/O+t/keubgbHKLYv2jjHeMVN7m535EjVw58FDzI+0 Li1rhmlG6c6jXxAtBeOgp6SV//0KiXmR/E7084V+iR12yEkeL2QZa1wicovkEeKK4E+C Mp7A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date; bh=PL+KDKMoxl90C56VC6ePxYHC9FQvY6T+GT0rJGnOf9g=; b=g80OEA27q44fBrTK+b3NfVAbCKYGwI8S9SBu3yMR0pRSHq/9vp9YLNbmbOK1WxTdmi rgw8uF/new/f1Ho+OO1hUAt4OQg3nr70FfX0R+Q6zbsfDQuuPpQpA4ZeIFnrcSxRu0xf qqhJn+5bFsI/SVo9r6aRGaNDsWMf7jnc99KPhR6u6gzmA9NMETft0byZjj/549CznyVG 052Qdt3fnBBI6uOAur4q2J3pd793Uvu4JEi/SxUPvY2qzRcjWX2p+0ZvjH26tEL6dns9 rJhWjiwFNzk8PpJmJVMF4u7t08Pp5Iw04XKtXNv1rT82PIYUfBlrnDqVROddbX3IQCrl OWlA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id i8si6287389edj.113.2020.08.02.04.51.45; Sun, 02 Aug 2020 04:52:10 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727914AbgHBLvh (ORCPT + 99 others); Sun, 2 Aug 2020 07:51:37 -0400 Received: from jabberwock.ucw.cz ([46.255.230.98]:50772 "EHLO jabberwock.ucw.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726578AbgHBLvd (ORCPT ); Sun, 2 Aug 2020 07:51:33 -0400 Received: by jabberwock.ucw.cz (Postfix, from userid 1017) id 16A0E1C0BD4; Sun, 2 Aug 2020 13:51:31 +0200 (CEST) Date: Sun, 2 Aug 2020 13:51:24 +0200 From: Pavel Machek To: Vitaly Chikunov Cc: Arnaldo Carvalho de Melo , peterz@infradead.org, Ingo Molnar , Arnaldo Carvalho de Melo , linux-kernel@vger.kernel.org, "Dmitry V. Levin" Subject: Re: Should perf version match kernel version? Message-ID: <20200802115124.GA1044@bug> References: <20200729155647.xte33krus3mak3wu@altlinux.org> <20200729160220.GB2655@hirez.programming.kicks-ass.net> <7CEC30D2-0C1E-4E88-A1D2-35C121EB1013@gmail.com> <20200729175704.gsbh4gkbqxas5j2t@altlinux.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200729175704.gsbh4gkbqxas5j2t@altlinux.org> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi! > > >We strive to have it all compatible, older perf should work on newer > > >kernel and newer perf should work on older kernel. > > > > > >How well it's all tested is another. > > > > > >Personally I often use a very old perf. > > > > Yeah, never was a requirement, if you find some problem using a new perf on an old kernel or the other way around, please report. > > That's great to know. Thanks for the answers! Someone should tell debian, AFAICT they believe perf version == kernel version is a requirement...and so says their manpage. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html